Filter.



C. G. OSGOOD.

FILTER.

APPLLGATION FILED AUG. 2o, 191s.

1,128,495. Patented Feb. 16, 1915. l 3 SHEETS-SHEET l.

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C. G. OSGOOD.

FILTER.

APPLIUATION FILED mazo, 1913.

Patented Feb. '16j 1915.

3 SHEETS-SHEET 2.

WXTNESSES:

1N V ENTOR G. G. OSGOOD.

FILTER.

APPLICATION YILED AUG. 20, 1913y 1,128,495, Patented Feb.16,'1915.

s SHEETS-SHEET a.

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CHARLES G. OSGGOD, OF TONOPAH, N1? VIDA, ASSGNOR 0F FIFTY ONE-HUNDREDTHSTO THE MONTANA-TQNOPAH MINES CO., OF TONOPAI-I, VADA, .A CORPORATION FDELATNARE.

FELTRE..

Speccation of Letters Patent.

Application led August 20, i913. Serial No. 785,696.

T0 all @ciw/a it may concern feiada, have invented new and useful lin`lmovements.in Filters, of which the 'followng is a` specification.

'.l`his invention relates to a lilter, and parcularluf' pertains to afilter for removing `iquids from solusions and erining susended solidsinto a porous mass.

lt is the object of this inveniion to proide method of i'ilration and anapparatus or accomplishing' same by means of which :eluticns may beeffectively separated from olid matter and which is especially adapt- -dfrr use in filtration of slimes in cyanid vperations and for abstractingthe thickened ulp from wood pulp solution, filtering sphaltum from gassolutions, and clarifyfig water and other liquids.

A further object is to provide a filtering pparatus, by means of whichthe pulp or l)lid matter held in suspension in a liquid lay be separatedfrom the liquid, and armed into hollow cylinders of considerable ngthwith walls of varying thickness and y which the cylinders illus formedcan he ioroughly washed of pregnant solutions by cleansing liquidwithout previous removal if.' the pulp cylinders from the apparatus.

Another objec is so provide a means and :cthod of filtration ,in whichehe separated ilp will he'so Jfornied and held in mass hat oisture canbe edectiyely removed there- -om without causing separation of theparcles and fracture of the mass, thus insuruniform resistance to thepassage of mid therethrough so that Ldie pulp will he ir-roughlycleansed tiroughout during a a shine;- operation. v

Another ohiect is to provide means hy uic-h the pulp cylinders can bereadily reored when the moisture has been extraced erefroni wii'houi:dismantling any of e apparatus.

il further objeci; is to lil ration which is own leaf filter proce' inil'iorenghness,

pacity per unit of space, economy and connience of operation,adaptability to variapplications, and in which ehe diiiicullsencountered 'oy the use or leaf ltere., l:h unequal building up of thepulp -ss on the filter plaies. the impresentable rammed ree. ie, isis.

breaking and fracture of pulp mass during operation, and the diflicultremoval of the pulp mass and cleaning' of the lter leaf, is obviated.

(lther objects will appear hereinafter.

'll he invention primarily resides in a series oi. lter-spikes formedwith a tapered core rectangular in cross-section and having longitudinalcorrugations on its sides, and a filter fabric inclosing the core; ameans for attaching the core with vthe iilter fabric thereon to amanifold suction pipe; and means by which the liquids in a pulp intowhich the spikes are intrcduced may be drawn olf through thefilter-spike and inanifold, and a cylinder of the solid substances inthe pulp formed on the llter-spike, and which pulp will be dischargedfrom the lilter-spilfe on the breaking of the suction 0r vacuum.

The invention further consists of the parts and the construction andcombination of parts as hereinafter more fully described and claimed,having reference to the accompanying drawings, in which- Figure l is aplan View of the filter apparatus. Fig. 2 is a section and elevation onthe line (L-a of Fi. l. Fig. 3 is a detail plan View of the upper end ofa filter-spike with parts broken away. Fig. 4 is a detail 85 inelevation of the upper end' 0l a filter-spike with the lter-jacketremoved and with parts broken away. F ig. 5 is a. detail section. on theline -b of Fig. 3. Fig. 6 is a detail section on the line c-c of llig.Fig. 7 is e0 a detail section on the line Z-ci of Fig. 5. in thedrawlngs A and B represent a pair of parallel horizontally extendingmanifold pipes which are spaced a suitable ldistance apart and areconnected at their inner ,ends

with a pipe C leading to a suction plump' (not shown) of any suitable?description. Cut-oil? valves 2 are provided in the inaniiiold pipes andB adjacent to their'inner ends for the purpose of cutting of? and conftrolling the suction in the pipes A and B from the pipe C, and cut-odvalves 3 are provided atrthe outer ends of the pipes A and B for thepurpose of opening the pipes to the atnwspherer Extending laterallybetween the manifold pipes and B, mediate the valves 2 and 3, is a.series of header pipes l which are connected a their ends to themanifold pipes 'and B, as particularly shown in Fig.

Mounted on each header 4 is a series of dependent filter spikes each ofwhich .consists of a rectangular core 5, covered With a jacket (3 ofsuitable filter fabric. The core 5 of each filter spike is taperedto'converge longitudinally from its upper to its lower ends and isformed with cross channels 7 on its upper end, and vertical grooves orcorrugations 8 on its sides. lLach spikel 5 1s connected at its upperend to a horizontal plate 9 conforming in outline to the end of thespike, by means of screws 10, which plate is screwed on a nipple/11depending from the underside of the header 4.. The filterjacket4 orsleeve 6 is held in place on the core 5 by means of a nut 12, screwed onthe nipple 11; the upper end of the jacket 6 extending over the top ofthe plate 9, beneath an annular plate 13, thence passing 'upward overthe inner'edge of the plate 13, is disposed on the upper face thereofbeneath a Washer 14 which is caused to bear on the plate 13 to clamp theilteujacket in place by means of the nut 12 on the nipple 11. The lowerend of the nipple 11 extends through the plate 9 so as to form an opencommunication between the interior of the header l and the channels 7 onthe upper ends of the spike core 5. The filter spikes on the head- =ers4 are arranged comparatively7 close together and are designed to extenddownwardly into a tank or vat 15 of any suitable construction,containing the liquid to be filtered, which liquid for the purpose ofillustration will be considered as slimes containing a cyanid solution.

In operation, to remove the pregnant solution from the slimes inthe vat15, the iilter spikes are submerged in the slimes and a suction orvacuum is induced in the manifold pipes A and B through the pipe C bymeans of any suitable pump; the Valves '2 being open and the valves 3closed. The suction induced in the manifold pipes A and B will operatethrough the headers 4 to draw the liquids in the vat 15 through the:filterjackets 6 throughout their length; the liquids passing upwardalong.the corrugations 8, thence \through the channels 7, nipples 11,headers 4 and manifolds A and B and pipe C to any suitable point ofdischarge. The insoluble material in the slimes or pulp in the vat beingunable to pass through the filtering medium Will collect on the outerfaces of the ilter-jackets 7 and accumulate thereon in such manner as toform a cylindrical mass extending throughout the length of each filterspike, which mass Will gradually increase in thickness and diameter asthe liquids 'are drawn from `the vat, The

cake formed on each spike has on the outside surface the same diameterat the top and bottom, thus assuming the shape of a cylinder. The innersurface of the cake conforms to the shape of the outside of the spike,

these points there is a gradual Variation from maximum to minimum, etc.As the cross-section of the spike more nearly approaches a circle (byincreasing the number of faces on the spike) the more closely the pointsof maximum and minimum follow one another on the circumference, andcon-- sequently mfr nearly uniform the cake becomes in cross section. Ona vertical section thecake Varies in thickness by an amount equal to thetaper on each. face of the spike, irrespective of the cross-section. Thecylindrical shape, or circular cross-section, of the cake, adds to itsstrength and makes it better able to resist external forces, as currenteddies due to pumping, etc. That is, it makes it self-supporting, andconsequently freer from cracking and dropping during periods in thecycle in which the spikes are not submerged, and the cake is held inplace by Vacuum and adhesion only. rl`he cake will build up in series ofconcentric rings, and every point in the same ring will be affected bythe force of the internal vacuum to exactly the same degree. In thebuilding of the cake there can be no permanent 'lines of leastresistance. rfhe vacuum will. act more strongly, and consequently morerapid cake building will take ,place aiong these lines of leastresistance, and this will continue until the equilibrium is restablishedover the Whole surface ofthe cake. 'iihen the liquids have been drawnfrom the Vat,

the yacuum gradually decreases the amount. of moisture held 1n the cake,and a consec quent shrinking and decrease in the outside diameter of thec. ke results. As the cake shrinks, the outsiqile circumference isdecreased in proportion, preserving at ali times a uniformly smoothsurface free from cracks. When it is desired to Wash the pulp mass orcake thus formed on the lter spikes,a Wash solution of any descriptionis placed in the vat 15; this solution being drawn through the pulp massand discharged by the suction pump in the manner employed in removingthe'pregnant solution. During the Washing operation, the force of theinternal vacuum acting at the surface of the cake Wiil at' I every pointbe exactly the, same. Cons-e" i nipple on the header, a plate screwed onthe nipple,a rectangular tapered core attached .at one end'to saidplate, said core formed `iwith longitudinal grooves on its sides and achannel on its vend leading to the nipple, a jacket of filter fabricsurrounding the core, an annular lplate encircling the nipple adjacenttoithe plate, and a wasiier and nut on the nipple contiguous to theannular plate, [saidvv :out screwed on the nipple and adapted, to clampthe end of the jacket in place. r `4.l In 'a lter, the combination of auid conduit having connections for a vacuum producing means, valvescontrolling the vacuum in the conduit, a series of headers connectedwith said conduit, a sei-ies of spike cores connected with and supportedby the 'respective headers, said cores each being rectangular in crosssection and tapering to its smaller lower end, said cores havinglongitudinal grpoves and channels connecting the grooves withtheinterior of the headers, a filter jacketsurrounding each core, andair valves in said vcoiidliit whereby on the firstaamed-valve's Abeingclosed and said air valves opened the filter spikes automaticallydischarge the cake.' t

5. In a filter,l the combination of a suspended filter lspike having acore which is .shape and of substantially uniform diameter throughoutits length, and means whereby on the breaking of the vacuum the cake isautomatically discharged from the spikewithout the application of'internal or eX- ternal uid pressure, nor movement of iior in any portionofthe filter unit or frame, noi' the apparatus as a whole.

6. A `lltering apparatus including a. spike rectangular in cross sectionand tapered from the upper end toward the smaller, a filtering mediumcovering the spike, and means for drawing liquid through the spike tocause tlie solid substances to form in a cylindricalmass on said spike.

In testimony whereof l have hereunto set my hand in the presence of twosubscribing witnesses.

CHARLES G. OSGOOD.

Vitnesses:

IRWIN. D. MCCBAY, ROBERT A. GILLERN.

